Research on the halftoning method to achieve high-fidelity printing

摘要

We can extend ink color development space by using high purity, other than the four-color ink and more than four-color separations and halftoning replication methods in order to more accurately reproduce the original color. A new printing images halftoning method of frequency modulation amplitude modulation was studied in this paper. This method is based on the principle of AM halftoning, only changed the AM screening lines among the different halftoning images, that is changing the spatial distribution frequency of screen dots, in this way, even in the smaller screening angle (sometimes, even in the same screening angle), we can also achieve the screen dots overlapped images and avoid producing moire fringe. If this method is combined with the conventional same frequency four-color AM halftoning method, we can realize the more than four-color halftoning without obvious moire fringe. The frequency conversion AM halftoning configuration method of four-color plus spot colors was proposed in this paper, and non-frequency modulation halftoning high-fidelity printing images were obtained. The results showed that the images achieved the desired effect of high-fidelity printing.